Definitions from Wiktionary ( )

▸ adjective:  Of a surface, having low friction, often due to being covered in a non-viscous liquid, and therefore hard to grip, hard to stand on without falling, etc.
▸ adjective:  (figuratively, by extension) Evasive; difficult to pin down.
▸ adjective:  (obsolete) Liable to slip; not standing firm.
▸ adjective:  Unstable; changeable; inconstant.
▸ adjective:  (obsolete) Wanton; unchaste; loose in morals.

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